Who are the people who conquered Athens and Sparta?
The Macedonians, a Hellenistic people to the North of Greece, conquered an army of Greek city-states at the Battle of Chaeronea in the Fourth Century BC. Athens and Sparta were among them, but the Greak coalition was led by Thebes which had replaced Sparta as the leading political force in Greece, just as Sparta had earlier destroyed the power of Athens. The Macedonians were well-organized, skilled at war, and led by the able king Philip of Macedon. Greece remained a Macedonian territory until the arrival of the Romans, whereupon both became Roman territory.